AbstractPostfield


1   // Copyright 2004, 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.wml;
16  
17  import org.apache.tapestry.IMarkupWriter;
18  import org.apache.tapestry.IRequestCycle;
19  import org.apache.tapestry.form.AbstractFormComponent;
20  
21  /**
22   * A base class for building components that correspond to WML postfield elements. All such
23   * components must be wrapped (directly or indirectly) by a {@link Go}component.
24   * 
25   * @author David Solis
26   * @since 3.0
27   */
28  
29  public abstract class AbstractPostfield extends AbstractFormComponent
30  {
31      /**
32       * @see org.apache.tapestry.form.AbstractFormComponent#renderFormComponent(org.apache.tapestry.IMarkupWriter, org.apache.tapestry.IRequestCycle)
33       */
34      protected void renderFormComponent(IMarkupWriter writer, IRequestCycle cycle)
35      {
36          writer.beginEmpty("postfield");
37  
38          writer.attribute("name", getName());
39  
40          String   varName = getVarName();
41          writer.attributeRaw("value", varName != null ? getEncodedVarName(varName) : "");
42  
43          renderInformalParameters(writer, cycle);
44  
45          writer.closeTag();
46      }
47  
48      private String   getEncodedVarName(String   varName)
49      {
50          return "$(" + varName + ")";
51      }
52  
53      public boolean isDisabled()
54      {
55          return false;
56      }
57  
58      public abstract String   getVarName();
59  
60      public void updateValue(Object   value)
61      {
62          getBinding("value").setObject(value);
63      }
64  }
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